LayoutTests/fast/hidpi/image-srcset-simple-2x.html - WebKit - Git at Google

 <html>
 <head>
 <script>
     window.targetScaleFactor = 2;
 </script>
 <script src="resources/srcset-helper.js"></script>
 <script src="../../resources/js-test-pre.js"></script>
 <script>
     addEventListener("load", function() {
         shouldBeTrue('document.getElementById("foo").clientWidth==200');
     }, false);
 </script>
 </head>

 <body id="body">
     <div>This test passes if the image below says 1x with a reddish background when the deviceScaleFactor is 1, and if says 2x with a greenish background when the deviceScaleFactor is 2.</div>
     <img id="foo" src="" srcset="resources/blue-100-px-square.png 1x, resources/deleteButton.png 3x, resources/green-400-px-square.png 2x">
 </body>
 </html>
	<html>
	<head>
	<script>
	window.targetScaleFactor = 2;
	</script>
	<script src="resources/srcset-helper.js"></script>
	<script src="../../resources/js-test-pre.js"></script>
	<script>
	addEventListener("load", function() {
	shouldBeTrue('document.getElementById("foo").clientWidth==200');
	}, false);
	</script>
	</head>

	<body id="body">
	<div>This test passes if the image below says 1x with a reddish background when the deviceScaleFactor is 1, and if says 2x with a greenish background when the deviceScaleFactor is 2.</div>
	<img id="foo" src="" srcset="resources/blue-100-px-square.png 1x, resources/deleteButton.png 3x, resources/green-400-px-square.png 2x">
	</body>
	</html>